Equipment - Micro & Milli ohm meter for checking the secondary circuits of resistance welders.

LUNCH BOX®

Micro & Milli
Ohm Meter

Specs and User Manual

Micro Ohm Meter:

The Micro Ohm Cable Tester (MOCT7550) measures from 3 to 2000 micro ohms and can be used to measure the resistance of secondary weld circuit components.  These include kickless cables, water cooled jumpers, laminated shunts, air cooled jumpers, weld gun castings, weld tips joints, weld transformers, oxidation in joints, connectors, or any component that can increase in resistance. This Meter is a tool that can be used for both preventive maintenance and for troubleshooting the secondary welding circuit.

WARNING: ALL PRIMARY POWER MUST BE TURNED OFF AND DISCONNECTED BEFORE USING THIS METER ON SECONDARY COMPONENTS!

Shown with Optional
Ergonomic Pistol Probes

Milli Ohm Meter

The Milli Ohm Cable Tester (MOCT76000) measures from 0.3 to 200 milli ohms and can be used to measure the resistance of primary (440 volt) weld circuit components.  These include the primary supply cable, circuit breakers, crimped lugs, bolted joints or any component that can increase in resistance.

WARNING: ALL PRIMARY POWER MUST BE TURNED OFF AND DISCONNECTED BEFORE USING THIS METER ON PRIMARY COMPONENTS! ADDITIONALLY, ANY CAPACITORS OR POWER STORAGE DEVICES MUST BE DISCONNECTED OR DISCHANRDE BEFORE USING THIS METER!

Both meters use a 4 wire Kelvin probe system. Each probe passes test current through the outer points of the probe and the voltage is sensed by the center pin.  With this method, errors caused by the resistance of the leads and the contact resistance is eliminated.  A stable 2.5 Amp Current source is incorporated into the meter providing high accuracy measurements to be displayed on a large 3 ½ digit LCD display.

An automatic power On/Off is incorporated in the meter to provide optimum battery life.  Indicators on the LCD display warn of low battery voltage levels.